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84
LCM(28, 6) = 84.
LCM(6, 21, 28) = 84.
28 is a factor of 168 {28 x 6 = 168}, so the LCM is 168
It is: 420
6
14 = 2*7 45 = 5*9 LCM = 14*45 = 630
The LCM is 28.
The LCM is: 28